A reduction in sea ice due to climate change has negatively affected the food abundance of .

A. Frigates
B. Albatrosses
C. Penguins
D. Plovers
E. Pelicans

A reduction in sea ice due to climate change has negatively affected the food abundance of Penguins.

Explanation:

Sea ice is ocean water frozen blocks. Unfortunately, rather than most other areas, climate change impacts Antarctica. If the temperatures on the surface of air and water rise, the sea ice melts. This leads to many marine mammals and seabirds losing their habitat and food supply, including Adelie penguins.The biggest threat to the penguins stems from changes in the Antarctic sea-ice cover, that will affect its feeding and breeding.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.